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Grumman Cougar twin power needs (Dennis Tapsfield drawing)

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Old 10-19-2003, 12:14 AM
  #1
PeterH
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Default Grumman Cougar twin power needs (Dennis Tapsfield drawing)

I've been wanting to build this for years - - I enlarged a freebie plan of it from a German magazine (Flug & Model Technik) up to what I thought was 'original' size, roughly two meters. I have a pair of HB .25's that I hoped to use in a twin, the Cougar if possible.

Has anyone had any experience with this aircraft, and any comments as to the power it needs?

Thanks very much.
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Old 10-19-2003, 01:58 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

Peter:

Cougar. F9F. Swept wing version of the Panther. Single engine.

There was another very similar airplane with twin engines, but the name escapes me at the moment.

Bill.
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Old 10-19-2003, 08:24 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

The Grumman American Cougar appeared as a construction article in the August 1980 RC Modeler. They may have reprints and full size plans.
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Old 10-19-2003, 10:34 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

LOOKS INTERESTING. Here are the details from the plans store on RCM Magazine site.
PLAN pl-807
GRUMMAN AMERICAN COUGAR Our Price $15.00

by Dennis Tapsfield,

76" span, 815 sq. in., (2) .20-.25, 6 ch., built-up balsa, plywood, and hardwood, two sheets (2) 34" x 60",


Issue: RCM 8-80,
RCM site - http://www.rcmmagazine.com
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Old 10-19-2003, 02:23 PM
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William Robison
 
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

OK folks,

Sorry about my earlier comment. I didn't know of the piston twin Cougar.

Bill.
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Old 02-03-2011, 09:58 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

Been a few years since the last post - but I just came across this so - for what it's worth..

I built the Cougar from RCM plans -
I'll go into details if anyone is interested.

IT FLEW VERY VERY VERY WELL.
I was told it was a fantastic Sky King impersonation(Iknow, not the same plane)
A never had an engine out with it. (pair of OS engines)
It was just a great airplane, but I sold it to someone who made an affer I couldn't refuse.

I have pics and lots of details if anyone is interested - just lemme know -

Gerry
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Old 02-03-2011, 11:56 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

It's always interesting to read & see pics of different twins, this is
definately a plane I would consider building as all of Dennis's planes
seem to be excellent fliers.

Bill D.
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Old 02-03-2011, 09:35 PM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

The full-size Grumman GA-7 Cougar was designed from the ground-up as a twin; it's not based on the Tiger/Cheetah. It was very well designed, and has a Vmc a few knots BELOW stall speed. But the timing was terrible, being introduced just as GA was beginning it's long, slow decline. Only 115 were built in 1978-79. It's only been involved in three fatal accidents in the U.S. in over 33 years of flying, an amazing record. I'm sure it would be a fantastic model.

I'd love to have one, but I can only only afford half of a 1957 Cessna 172 right now! Russ Farris
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Old 02-09-2011, 07:11 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)


Quote:
ORIGINAL: gerryhdtv

Been a few years since the last post - but I just came across this so - for what it's worth..

I built the Cougar from RCM plans -
I'll go into details if anyone is interested.

IT FLEW VERY VERY VERY WELL.
I was told it was a fantastic Sky King impersonation(Iknow, not the same plane)
A never had an engine out with it. (pair of OS engines)
It was just a great airplane, but I sold it to someone who made an affer I couldn't refuse.

I have pics and lots of details if anyone is interested - just lemme know -

Gerry
Hey Gerry let's see the pics of the Cougar and the details, "Subscribed"
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Old 02-09-2011, 09:56 AM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

Bill -
  Thanks for the interest!
I'll look for the best pics to scan, and try to post them up here this week.
You know, now if I take a picture it's already digital, finding and scanning older pictures can be a pain!

Gerry




Here's a link to some of my the other planes I've had over the years,
as well as some friends of mine:


http://www.iinet.com/~gjdonovan/PLANES.HTM
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Old 09-03-2011, 09:02 PM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

Hi,
I have the chance to purchase a cougaR WITH 2 X OS 40 FS. Would appreciate some of your photos. What did your weigh? thanks. Bill
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Old 09-03-2011, 11:35 PM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

I have to dig out and scan to get the photos online, but I hope to do that soon.
Weight , ready to fly was 8 1/2 lbs. - Yes, I used a bit of contest balsa to keep it as light as possible.
Power was  (2)  OS .25 FSR turning Master airscrew 9x6's.
The 2 OS 2 strokes really put out the power, and are the SAME as in the prototype that was featured in RCM.
I also had the Goldberg retracts, just like the prototype, I would not do that again. (2 retract servos).

I sold it to the brother of a good friend of mine who "had" to have it right when I needed some cash.
Anyway, photos to come, and thanks for asking!!

Gerry
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Old 09-04-2011, 10:27 PM
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Default RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

I have been told that the one I am interested in is 2.5kg fuselage and 3.2 kg wings. about 6kg ready to fly which is about 13.2 Lbs. Seems a bit heavy. Bill
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Old 02-27-2017, 07:16 PM
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Quote:
Originally Posted by gerryhdtv View Post
Bill -
* Thanks for the interest!
I'll look for the best pics to scan, and try to post them up here this week.
You know, now if I take a picture it's already digital, finding and scanning older pictures can be a pain!

Gerry




Here's a link to some of my the other planes I've had over the years,
as well as some friends of mine:


http://www.iinet.com/~gjdonovan/PLANES.HTM
Several years ago I bought this model from a guy, he threw it in with a bunch of other stuff I was taking off his hands, (Twinstar, TF DC 3 Kit, engines.....). The plane is in good shape, needs some love to get it in the air - which I never had the time to get around to doing. Well, I am forcing myself to talk the time now, and going through the box of stuff I got from this guy, I found the original plans for the plane.

Made the decision to build it last week. I have started the process of making the parts from the plans, most of the balsa parts are done, just need to get the ply parts cut (my son will try to get them cut in his wood shop class.

Don't think my new build will be ready for the flying field this year, but maybe next, the one I bought needs a bit more love, but changing a servo or two, new fuel tanks and line and fixing a bit of hanger rash and she will be ready to go. Only major issue is one of the originals Goldberg mechanical retracts is broken and cant be repaired. I have now set it up with fixed gear that should be fine. Can't wait to get her in the air, then have a second one done by my own hands. Twins are fun stuff.
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Old 04-03-2017, 06:00 PM
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The build has started. Wings are both in progress and looking good so far.

I continue to take a look at the plans over and over again, thinking about how I can improve given the advances in technology and materials since 1980. Think I will try to form Fibreglass cowls as one improvement.
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